It was officially created by splitting the north-eastern part from the province of Milan on 12 May , and became executive after the provincial elections of 6 and 7 June The province had a population of , divided in 55 comunes. It borders the provinces of Lecco and Como to the north, the province of Varese to the west, the province of Bergamo to the east and the Metropolitan City of Milan to the south-east. The top ten municipalities in the province of Monza and Brianza sorted by number of inhabitants are:. The 55 municipalities [2] [3] in the province are:.